It is possible that multiple implementers may define Private Elements with the same (odd) group number. To avoid conflicts, Private Elements shall be assigned Private Data Element Tags according to the following rules.
Use the CreatePrivateCreatorDataElement Method to create a Private Creator Data Element to reserve 256 private data elements for your own use. These tags will be odd numbers (all of the predefined tags are even numbers). For example, suppose you want to add the following three private elements to a DICOM data set:
You would first reserve the elements by adding the corresponding private creator data element (0017,0012).
When using the CreatePrivateCreatorDataElement Method, the created private creator data element is on the same level as element (A DicomElement in the data set. The Private Creator Data Element will be inserted at the same level as this item.). If element is null, the private creator data element is created at the top or first level.
This method is used together with any of the following functions:
to create private elements in a DICOM data set.
a) The versions of the standard prior to V3.0 described shadow groups. These were groups with a group number one greater than the standard groups. Elimination of conflicts in Private Data Element Tags have made this distinction obsolete and this terminology has been retired.
b) The versions of the standard prior to V3.0 specified private group element numbers (gggg,10FF-7FFF) reserved for manufacturers and private group element numbers (gggg, 8100-FFFF) reserved for users. Elimination of conflicts in Private Data Element Tags has made this distinction obsolete and this specification has been retired.
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